From patchwork Tue Mar 19 07:46:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenyou Yang X-Patchwork-Id: 2299201 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 64D1DDFB79 for ; Tue, 19 Mar 2013 07:52:54 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UHrIh-0003CN-US; Tue, 19 Mar 2013 07:49:40 +0000 Received: from eusmtp01.atmel.com ([212.144.249.242]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UHrIX-00038I-CP for linux-arm-kernel@lists.infradead.org; Tue, 19 Mar 2013 07:49:30 +0000 Received: from apsmtp01.atmel.com (10.168.254.31) by eusmtp01.atmel.com (10.161.101.30) with Microsoft SMTP Server id 14.2.318.4; Tue, 19 Mar 2013 08:49:26 +0100 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.atmel.com (10.168.254.31) with Microsoft SMTP Server id 14.2.318.1; Tue, 19 Mar 2013 15:49:24 +0800 From: Wenyou Yang To: Subject: [PATCH v7 06/14] spi/spi-atmel: add flag to controller data for lock operations Date: Tue, 19 Mar 2013 15:46:03 +0800 Message-ID: <1363679163-3897-1-git-send-email-wenyou.yang@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1363678866-3567-1-git-send-email-wenyou.yang@atmel.com> References: <1363678866-3567-1-git-send-email-wenyou.yang@atmel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130319_034929_649585_51D34F2A X-CRM114-Status: GOOD ( 10.52 ) X-Spam-Score: -4.4 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -2.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: richard.genoud@gmail.com, JM.Lin@atmel.com, broonie@opensource.wolfsonmicro.com, nicolas.ferre@atmel.com, linux-kernel@vger.kernel.org, wenyou.yang@atmel.com, grant.likely@secretlab.ca, spi-devel-general@lists.sourceforge.net, plagnioj@jcrosoft.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Nicolas Ferre Will allow to drop the lock during DMA operations. Signed-off-by: Nicolas Ferre Cc: spi-devel-general@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org [wenyou.yang@atmel.com: submit the patch] Signed-off-by: Wenyou Yang --- drivers/spi/spi-atmel.c | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 4692f1f..f28ce22 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -195,6 +195,7 @@ struct atmel_spi_caps { */ struct atmel_spi { spinlock_t lock; + unsigned long flags; resource_size_t phybase; void __iomem *regs; @@ -333,6 +334,16 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi) gpio_set_value(asd->npcs_pin, !active); } +static void atmel_spi_lock(struct atmel_spi *as) +{ + spin_lock_irqsave(&as->lock, as->flags); +} + +static void atmel_spi_unlock(struct atmel_spi *as) +{ + spin_unlock_irqrestore(&as->lock, as->flags); +} + static inline int atmel_spi_xfer_is_last(struct spi_message *msg, struct spi_transfer *xfer) { @@ -569,9 +580,9 @@ atmel_spi_msg_done(struct spi_master *master, struct atmel_spi *as, "xfer complete: %u bytes transferred\n", msg->actual_length); - spin_unlock(&as->lock); + atmel_spi_unlock(as); msg->complete(msg->context); - spin_lock(&as->lock); + atmel_spi_lock(as); as->current_transfer = NULL; as->next_transfer = NULL; @@ -802,13 +813,11 @@ static int atmel_spi_setup(struct spi_device *spi) spi->controller_state = asd; gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH)); } else { - unsigned long flags; - - spin_lock_irqsave(&as->lock, flags); + atmel_spi_lock(as); if (as->stay == spi) as->stay = NULL; cs_deactivate(as, spi); - spin_unlock_irqrestore(&as->lock, flags); + atmel_spi_unlock(as); } asd->csr = csr; @@ -827,7 +836,6 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg) { struct atmel_spi *as; struct spi_transfer *xfer; - unsigned long flags; struct device *controller = spi->master->dev.parent; u8 bits; struct atmel_spi_device *asd; @@ -892,11 +900,11 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg) msg->status = -EINPROGRESS; msg->actual_length = 0; - spin_lock_irqsave(&as->lock, flags); + atmel_spi_lock(as); list_add_tail(&msg->queue, &as->queue); if (!as->current_transfer) atmel_spi_next_message(spi->master); - spin_unlock_irqrestore(&as->lock, flags); + atmel_spi_unlock(as); return 0; } @@ -906,17 +914,16 @@ static void atmel_spi_cleanup(struct spi_device *spi) struct atmel_spi *as = spi_master_get_devdata(spi->master); struct atmel_spi_device *asd = spi->controller_state; unsigned gpio = (unsigned) spi->controller_data; - unsigned long flags; if (!asd) return; - spin_lock_irqsave(&as->lock, flags); + atmel_spi_lock(as); if (as->stay == spi) { as->stay = NULL; cs_deactivate(as, spi); } - spin_unlock_irqrestore(&as->lock, flags); + atmel_spi_unlock(as); spi->controller_state = NULL; gpio_free(gpio);